The present invention relates to a supply (MS) of flat film material (M), the flat film material (M) includes at least one layer of cellulose fiber material and has a longitudinal extension, an upper surface (106), a lower surface (108), a first longitudinal edge (102) and a second longitudinal edge (104), the first and second longitudinal edges (120, 104) being aligned at least approximately parallel to each other, comprising connecting means (200) for connecting the flat film material (M) in the region of the first and second longitudinal edges (102, 104) in order to form a tubular casing (T), wherein the connecting means (200) are arranged at least in the region of one of the first or second longitudinal edge(102, 104). The present invention further relates to a tubular casing (T) formed by a flat film material (M). a sausage-shaped product (S), like a sausage, comprising the tubular casing (M), a connecting device (50) for forming a tubular casing (M) from the flat film material (M), and a clipping machin
